CNN -- A new study suggests some obese women get one hour of vigorous exercise a year.
Researchers at the University Of Alabama at Birmingham looked at a year-long study that tracked the eating habits and activity levels of 2,500 adults.
Activities like jogging and jumping rope were considered "vigorous."
On average, obese women got just over an hour of vigorous exercise each year -- obese men got about three-and-a-half hours.
Experts recommend all adults complete over an hour of vigorous exercise each week.
Researchers say exercise can have a big impact on overall health -- and that obese patients should start with simple tasks like parking far away or taking the stairs.
The study was criticized for its definition of "vigorous exercise."
Some experts believe, for people who are morbidly obese, simply walking might be a vigorous activity.
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